[Spoiler (click to open)]So in the end Brad's character and his dog ends up killing the majority of the killers involved in the Manson murders when they break into his home while he was high on acid. It was very brutal. Leo kills the last one with the flamethrower he referenced using in a movie at the beginning of the film.

In the end Leo is greeted into the Polanski/Tate home and meets Sharon Tate. The end.

Does that imply that sharon would survive and the history has been changed? Or just an introduction into the inevitable that would be explored were there ever to be a sequel and Manson gets his "revenge"?